Old 11-10-2013, 02:22 AM #1
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Default Cheap ebay Pen Fun

I picked up a set of the cheap ebay red/green/blue pens:




I also had a glass block that had a motorcycle laser etched in it:



I decided to introduce the two. First the green:



Maybe a different angle?



Nothing very interesting I guess.

On to the red:



Again, nothing exciting.

Lastly, the blue:



Hey that's pretty cool! I pointed the beam at one of the edges. I tried the same thing with the red and green, but they didn't produce the same effect.

-Bob


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Old 11-10-2013, 02:26 AM #2
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Default Re: Cheap ebay Pen Fun

Hey cool effect. Wondering why the color change too. Sure someone will explain it soon.
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Old 11-10-2013, 03:46 PM #3
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Default Re: Cheap ebay Pen Fun

The green splits into three because the corner is chopped off so the beam hits three facets each directing the beam differently. It would remain a single beam if the entrance point wasn't at the corner. There's no color change here, though. There's a blue and a green in the last pic.
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Old 11-10-2013, 03:58 PM #4
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Default Re: Cheap ebay Pen Fun

Quote:
Originally Posted by Cyparagon View Post
The green splits into three because the corner is chopped off so the beam hits three facets each directing the beam differently. It would remain a single beam if the entrance point wasn't at the corner. There's no color change here, though. There's a blue and a green in the last pic.
Um, no, that's all blue in the last pic. I'm not talented enough to hold a camera and activate two laser pens at the same time. :wink:

The last pic is a blue ebay pen aimed at the top front corner of the block from about a 45 degree angle. The glass (corner) is refracting the some of blue, creating the lines while allowing some blue to pass, illuminating the block.

-Bob
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Old 11-10-2013, 04:33 PM #5
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Default Re: Cheap ebay Pen Fun

Oh, ok then. Maybe there is some fluorescence threshold that is only exceeded in the incident beam while the reflected light isn't strong enough then?
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Old 11-10-2013, 04:43 PM #6
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Default Re: Cheap ebay Pen Fun

Wait so that's just blue in the last pic?
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Old 11-10-2013, 04:52 PM #7
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Default Re: Cheap ebay Pen Fun

That is a pretty cool effect with a blue laser that turns into green inside the glass.
I wonder if I can reproduce that effect with pieces of glass I have laying here around.

***edit*** If the glass is fluorescence like uranium glass then the color will turn into green.


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Old 11-10-2013, 08:29 PM #8
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Default Re: Cheap ebay Pen Fun

Blord beat me to it. I've seen similar with my 405nm lasers. There's something in the glass that's phosphorescing under UV light* similar to the uranium marbles in the pic he posted. Depending how old that glass is it could be uranium glass which would explain it.




* Yes I know technically 405nm isn't UV light but it's close enough to the 400nm threshold where UV is defined to begin that it can trigger the phosphoresce effect.
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Old 11-10-2013, 11:51 PM #9
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Default Re: Cheap ebay Pen Fun

I believe the "blue" mentioned in the OP is a 405. I haven't seen a 3 pack with a 450nm diode in it. Or am I not up to date.
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Old 11-11-2013, 12:09 AM #10
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Default Re: Cheap ebay Pen Fun

I don't know the wavelength (or power) of the "blue" laser. All I know is that it's a cheap ebay pen.

I've taken some more pics, this time with the lights on:









The interesting thing is that, unlike in Blord's pics, only the beam is changed to green. The glass itself is bluish, or maybe more violet? And, the beam exiting the glass is blue.

-Bob
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All measured by a homebuilt LPM using a Delta Isis board, heatsinked Ophir head and Peregrine software.

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Old 11-11-2013, 12:52 AM #11
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Default Re: Cheap ebay Pen Fun

No doubt a 405. But that's so interesting how the wavelength is changed. I know it's been explained above but still neat.
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Old 11-11-2013, 02:21 AM #12
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Default Re: Cheap ebay Pen Fun

When a 405nm is shined through glass it will turn green and if refracted around the glass enough. multiple colors. Here is a pic of two prisms next to each other and two 405's shot into them from opposite sides. You can see the effect

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Old 11-11-2013, 04:33 AM #13
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Default Re: Cheap ebay Pen Fun

Now that is freaking cool.
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Old 11-11-2013, 04:41 AM #14
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Default Re: Cheap ebay Pen Fun

Quote:
Originally Posted by MagnaMagicBtu View Post
Well 405nm is only 5nm from 400nm and only 10nm from 395nm. So it can be considered Near-UV I guess...
And I'm less than half a century from having a negative age, so you could consider me a fetus I guess.
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Old 11-11-2013, 08:12 AM #15
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Default Re: Cheap ebay Pen Fun

Quote:
Originally Posted by djQUAN View Post
I believe the "blue" mentioned in the OP is a 405. I haven't seen a 3 pack with a 450nm diode in it. Or am I not up to date.
Yes a 405nm ,if a eBay pen comes out in 445nm or 450nm that would be great .I would certainly get a few .
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270 mW 405 nm 20MM Cannon shell focus-able
705 mW 405 nm focus-able 501b G2 lens

865 mW 445 nm Kryton Groove
1130 mW 450 nm focus-able custom
1175 mW 450 nm focus-able S4

1375 mW 445 nm WL ARCTIC S3
2.3 watt 445 nm G2 -Cree Q5
3.1 watt +Adj 445 nm Blitzbuck V3.1 9mm SS Survival host

95 mW 532nm custom focus-able
110 mW 532 nm S4 host
125 mW 532 nm SD 305A x 2
135 mW 532 nm SD 301 focus-able x2

135 mW 532 nm focusable laser SD 303 x2
175 mW 532 nm custom focus-able

494 mW 532 nm O like Crown*
100 mW 589 nm
PGL III C
115 mW 635 nm custom C6 host
800 mW 635 nm Hotlights host G1 lens

155 mW 645 nm custom 501b host
160 mW 650 nm focus-able C6 host
255 mW 650 nm SD301
280 mW 650 nm SD302
260 mW 660 nm custom C6 host
505 mW 660 nm custom C6 host
45 mW 650 red and 114 mW 532nm multi laser
350mW 830 nm IR custom C6 focus-able
Another
4 dozen plus 5 mW to 160 mW in all colors Way overspec ebay pens
LaserBee 3.7W USB Laser Power Meter

Last edited by Blaster; 11-11-2013 at 08:13 AM.
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Old 11-11-2013, 10:49 AM #16
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Default Re: Cheap ebay Pen Fun

Quote:
Originally Posted by brucemir View Post
When a 405nm is shined through glass it will turn green and if refracted around the glass enough. multiple colors. Here is a pic of two prisms next to each other and two 405's shot into them from opposite sides. You can see the effect

Hey! I have both a pi/2 radians prism as well as a pi/6 radians prism, but i cant produce the effect you achieved using either or both prisms.


can you elaborate on how you did this? I keep playing with the angles but cant find a spot where colors other than green appear.


EDIT: i should have put it in degrees. 90 and 30 degrees respectively.

Last edited by Dzarren; 11-11-2013 at 10:55 AM.
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